Year	Grams per day
1961	40.73
1962	38.19
1963	35.58
1964	36.36
1965	42.13
1966	46.57
1967	33.62
1968	43.73
1969	46.36
1970	41.96
1971	43.84
1972	43.64
1973	64.88
1974	66.78
1975	63.99
1976	73.26
1977	80.48
1978	84.14
1979	83.7
1980	80.6
1981	78.1
1982	77.92
1983	81.1
1984	73.54
1985	73.8
1986	80.51
1987	80.58
1988	82.89
1989	83
1990	83.92
1991	85.82
1992	77.09
1993	77.24
1994	75.07
1995	74.46
1996	73.45
1997	71.77
1998	74.17
1999	74.5
2000	71.08
2001	69.49
2002	73.73
2003	72.41
2004	72.49
2005	77.6
2006	76.89
2007	81.25
2008	78.99
2009	73.61
2010	78.85
2011	77.96
2012	77.08
2013	81.16